The organism drug regulator from European Union said Tuesday that it found no relationship between changes in menstrual cycles and the Covid-19 vaccines, after a study carried out in Norway suggested that some women had heavier periods after being inoculated.
A study of Norwegian Institute of Public Health (FHI) released Tuesday asked nearly 6,000 women between the ages of 18 and 30 about their menstrual cycles and bleeding patterns before and after vaccination. The article has not yet been peer-reviewed.
The first results showed that 7.6% reported more abundant periods before the first vaccination, which increased to 13.6% after; and 8.2% before the second dose, which rose to 15.3% after the second injection.
“More studies measuring hormone levels, etc. will be needed to fully determine this,” said Georgy Genov, chief of pharmacovigilance at the European Medicines Agency, at a press conference.
He also said that it was important to note that Menstrual disorders observed in emerging studies had been transitory.
The FHI said that young women who experienced a heavy menstrual bleeding and persistent after receiving the Covid-19 vaccine they may need to delay giving another vaccine until the cause is investigated and symptoms have stopped. They should also consult their doctor to rule out other conditions that may require treatment.
In case of temporary menstrual changes in a regular cycle, the next dose of the vaccine can be given as planned.
Genov He indicated that the agency does not have data to show that vaccines, including those for Covid-19, affect people’s fertility.